Many users will be confused by a number when they understand the FANGKUAI Boiler. Why is the thermal efficiency of the boiler produced by the fast-growing boiler reaching 108%?

The input of the condensing gas boiler is a certain volume of gas multiplied by the calorific value of the gas (the influence of the temperature, pressure and humidity of the air should be taken into account when calculating the heat), and the difference of the condition factors determines the calorific value of the gas has a high calorific value and a low calorific value. Points.

High calorific value: 1 standard cubic meter of gas is completely cooled after the flue gas is cooled to the original temperature, and the water vapor in the flue gas is discharged in the state of condensed water.

Low calorific value: 1 standard cubic meter of gas is completely cooled after the flue gas is cooled to the original temperature, but the water vapor in the flue gas is still the heat released by the steam state.

Obviously, the high calorific value of the gas is numerically greater than its low calorific value, and the difference is the latent heat of vaporization of the water vapor. The actual low-heat value of gas is commonly used in the actual engineering of industrial and civil gas applications. If calculated according to the low calorific value, the condensing gas boiler can absorb the latent heat of vaporization, and its thermal efficiency may reach 108%.

Then, why is the calorific value of the gas calculated according to the low calorific value not calculated according to the high calorific value?

This is because, in fact, the calculation of the calorific value of the gas by the operating instrument is to detect the volume and temperature of the flue gas generated by the complete combustion of the gas, and it is difficult to completely collect and cool the flue gas to the original temperature according to the definition of high and low calorific value of the gas. of. It can only be high-temperature discharge, measure the flue gas flow, calculate its volume and measure the temperature of the flue gas, calculate the heat through the heat capacity ratio of the flue gas; while the water vapor in the high-temperature flue gas is not cooled, it is still in the steam state. . This is consistent with the definition of low calorific value of gas, which is still a requirement for steam. Therefore, the calorific value of the gas in the thermal efficiency of the gas boiler is calculated based on the low calorific value. Then the gas condensing boiler absorbs the latent heat of vaporization, and its thermal efficiency will reach 108%.

The market researchers of Fangkuang boiler found that many users were confused when they purchased the boiler, and they were confused about the gas boiler with the "commercial condensation" label. I don't understand how it differs from the conventional gas boiler. Zhengzhou Fangxue Xiaobian will find out with you!

The difference between the two:

First, the applicable places are different
       A, commercial condensing gas boiler
       The commercial condensing gas boiler produced by Fangfang has been added to the Ultrate heat exchange component, the wing tube, which is designed and developed by itself. The heat exchange efficiency is more than 5 times that of the ordinary heat exchange tube. The heat exchange environment of the same heat exchange environment is designed to be shorter and larger. To save the boiler's floor space, it can save more than 40% compared with conventional gas boilers. It is suitable for hotels with small construction areas such as hotels, shopping malls and schools.
       B, conventional gas boiler
       Conventional gas boilers on the market basically use traditional fittings and systems, which are characterized by large weight, large volume, and non-removable, limited by the position and size of the boiler room.

Second, thermal efficiency
       A, commercial condensing gas boiler
       The heat exchange efficiency can reach 103% to 108%, which can be increased by about 30% compared with the conventional gas boiler. The boiler also incorporates international advanced combustion technology such as full premixing and FGR. When natural gas fuel is fully burned, the demand for air is reduced, there is no excess air, and the leakage point of the flue gas is increased, so that the flue gas enters the condensation stage as soon as possible to further Improve the combustion efficiency, the boiler heat exchange area is large, the thermal efficiency is high, the exhaust gas temperature can be as low as 50 ° C, and the heat loss is reduced.
       B, conventional gas boiler
       Some manufacturers generally indicate that the boiler design thermal efficiency is 90% in the brochure, but the actual thermal efficiency may only reach 70%~85%; the exhaust temperature is also in the range of 150~220 °C; the temperature control range is rough, and the precise temperature supply cannot be achieved. There is a problem of excessive consumption of energy by excessive heating; and the non-condensing heat exchange device has a high exhaust gas temperature and a high heat dissipation temperature of the furnace body, so the running cost is relatively high.

Third, safety and reliability and environmental impact
       A, commercial condensing gas boiler
       In today's society, intelligence is becoming more and more popular, and boilers must keep up with the direction of the times. The commercial condensing gas boiler produced by Fangfang can adopt the high intelligent PLC control system to complete the boiler startup, regulation and shutdown modes through simple operation of the operation interface.
       The boiler also has a number of safety protection measures. Pressure, temperature, scale, power supply, burner and other parts are equipped with monitoring and early warning probes. Once the fire of the safety accident is discovered, the early warning device can be quickly activated.
       The boiler is also equipped with insulation and mute components. The working noise is less than 60 decibels (normal speaking sound), and there is almost no environmental noise pollution. Therefore, the boiler can be placed in the living quarter without affecting the normal life of the residents and there is no disturbance. phenomenon.
       B, conventional gas boiler
       The various safety and security measures mentioned above require a lot of cost for R&D and manufacturing. Many boiler manufacturers will reduce some safety warning probes to save costs, which is a hidden danger for users.

Some boilers provide burners that use cheaper blast-type burners, which are more noisy and can affect the normal lives of nearby residents.

People's living standards are constantly improving, and the pursuit of heat in life is more efficient, energy-saving, comfortable and convenient, and low-environmental environmental protection. This trend has prompted the boiler industry to move toward a clean and low-nitrogen environment, and the corresponding low-nitrogen condensing gas boilers have also been introduced. Towards a more intelligent and diversified direction. So, what are the advantages of low-nitrogen gas boilers, why are they so praised by users?

The word “nitrogen” in “low nitrogen” refers to a series of polluting gases such as nitrogen oxides that have a bad influence on the atmospheric environment. A large amount of emissions into the air can cause bad weather such as acid rain and haze, giving people a life and Physical health poses a threat.

The emission of nitrogen oxides from ordinary gas-fired boilers can reach 150-200 mg/m3. In recent years, it has been gradually banned from burning or low-nitrogen reformation by China's environmental protection department. The low-nitrogen gas boilers significantly reduce nitrogen oxide emissions by using advanced low-nitrogen combustion technologies such as full premixing and FGR flue gas recycling. Fangxuan Boiler has introduced a low-nitrogen condensing gas boiler of less than 20 mg/m3, which is suitable for the most stringent environmental protection standards in China such as Beijing, Xi'an and Zhengzhou (standard 30 mg/m3).

What are the advantages of using a low nitrogen condensing gas boiler?
       1. Capacity expansion is good
       With seasonal changes or other circumstances, the user's demand for boiler heat output has also changed. The fast low-nitrogen condensing gas boiler can adopt multiple joint control modes, and the number of operating units can be flexibly adjusted according to different needs of users. User needs, and avoid unnecessary waste.
       2. Small footprint
       After thousands of tests, the boilers have been properly selected. Compared with ordinary gas-fired boilers, the boilers can save more than 20% of the floor space, lower the boiler building infrastructure requirements, and reduce the user input costs.
       3. Running quiet
       Fang quickly chooses the internationally renowned brand, Liya Road burner, which has good sound insulation effect and significantly reduces the noise generated by combustion and flue. The noise is less than 60 decibels (normal speaking sound).
       4. A wide range of applications
       Due to the modular design structure of the boiler, the installation and transportation are very flexible, and the emission of harmful substances is very low. It is widely used in large-scale use places such as hotels, office buildings, hospitals, shopping malls, schools, factories, etc.
       5. Energy saving and environmental protection
       The boiler is equipped with a natural gas combination proportional control valve and a full premixed fan, which not only ensures an excellent air-fuel ratio, but also automatically adjusts the boiler output to meet the dynamic heat load, so that the boiler heat output curve is as close as possible to the dynamic heat demand curve, Produce invalid output, heat exchange efficiency can reach 108%, realizing energy saving and environmental protection.

The low-nitrogen condensing gas boiler, as an independent central heating station heat source, is your best regional heating solution. For more details, please call the toll-free hotline: 0371-55629010, we will be happy to help you!

Some indoor swimming pools are still open during the cold winter season, mainly due to the indoor use of hot water boilers to heat and heat the water in the swimming pool.

In recent years, with the country's vigorous promotion of the "coal to gas" project, the northern regions of China have begun to use gas-fired hot water boilers to provide heating and hot water to residential areas, hotels, hospitals, shopping malls and some entertainment venues.

For some places with large area of ​​use, the gas-fired boilers with smaller capacity can not meet the heating demand; therefore, according to the needs of users, the gas boilers with different capacities can be designed with a new design concept, environmentally-friendly and efficient image. The boiler market has been widely recognized and highly evaluated by many customers.

Measuring the quality of a boiler is determined by a variety of factors. Comprehensive judgments such as thermal efficiency, input cost, use effect, environmental protection index, and post-maintenance can make the most comprehensive choice possible.

The gas-fired hot water boiler produced by Fangfang has achieved excellent results in the field of clean boilers with outstanding advantages such as high efficiency, durability, safety and reliability, and simple operation. It has won the favor and recognition of a large number of customers.

Nowadays, there are many brands of gas boilers on the market. Which brand is better?

FANGKUAI Boiler as a professional manufacturer of clean gas boilers, it not only has condensing gas boilers, commercial gas boilers, but also full premixed condensing gas boilers, which can provide suitable products for different needs of consumers.

Winter is approaching, heating is also put on the agenda by various heating units, and major boiler companies are competing to launch a variety of heating boilers, electric heating boilers are one of them. So, what are the key points to pay attention to when choosing an electric heating boiler?

First, choose the brand.
       When major boiler manufacturers sell their products, they always list all kinds of advantages and promises to the after-sales service, but they can do exactly what they promise. Therefore, when choosing a boiler, we must also consider the brand of the boiler manufacturer. Try to choose a boiler manufacturer with excellent product quality and good after-sales service to ensure your rights and interests.

Second, select power.
       When the electric boiler is used for heating, it needs to select the appropriate power according to the heating demand. If the power is too large, it will waste money, and the power is too small to meet the user's requirements. Generally speaking, the outlet temperature of electric boilers used for heating is above 70 °C. After 30 minutes, the temperature of the radiators of each household can reach about 75 °C; the heating area of ​​one cubic meter needs about 35W of heat, you can combine your own The required heating area is calculated to obtain the specific electric boiler power.

Third, choose technology.
       A good electric boiler should have high thermal power and fuel utilization, and it has a good experience in terms of insulation effect, safety protection, operating system and so on.
       The electric boiler body produced by FANGKUAI adopts reliable hydropower separation design, which has better safety. At the same time, it has multiple protection measures such as multiple water level, water temperature, secondary overheating, over temperature, leakage, antifreeze and power supply abnormality, among which antifreeze protection It is a unique patent technology that guarantees the safe operation of electric boilers.
       An inspection hole is arranged on the top of the boiler body, and a hand hole is arranged at the bottom for convenient inspection and maintenance.
       The boiler also has a variety of automatic control functions, which can be operated through the boiler's own operation interface to reduce manual consumption.
       The thermal insulation material is made of high-grade centrifugal glass wool for multi-layer insulation, the thermal insulation effect is good, and the thermal efficiency is naturally improved.

If you need electric boiler for heating project, please feel free to contact us through the free hotline of 0371-55629010. The professional technicians of FANGKUAI Boiler will be happy to provide you with services.

I believe that every user is full of doubts about the boiler when they first purchase the boiler. The choice of boiler model is undoubtedly one of the most important and difficult issues. If you choose a larger model, it will result in wast FANGKUAI Boiler makes a simple calculation formula. You can estimate the boiler capacity to be used according to your actual situation. Boiler capacity calculation formula: boiler model = actual height of the plant ÷ international height (2.8m) * building area When selecting the boiler model, the user's building area, the average height of each floor frame, the number of radiators, whether it is geothermal (if it is geothermal, the area can be doubled, and the area can be selected when it is large. two).

For example: there is a factory area of ​​10,000 square meters, the plant height is 5 meters, the boiler model is estimated: 5 ÷ 2.8 * 10000 = 17857 square meters, according to a ton boiler can meet 5500-6000 square meters to calculate, you need to choose 4 Steamed tons of boilers. And according to the temperature of different regions of the country, the area provided by each type of boiler will also change relatively. The colder north area, the heating area of ​​1 ton boiler will be reduced.

“Environmental Boiler” is a relatively general concept. In a broad sense, it refers to the emission of emissions such as waste gas and waste, and it is a boiler that does not only refer to a certain type of boiler.

According to China's latest air pollutant emission standards in some areas, the minimum emission standards for nitrogen oxides in Beijing, Zhengzhou and Xi'an have dropped to 30 mg/m³.

For fuel gas boilers, it is an “environmental boiler” by using advanced combustion technology or an environmentally friendly burner to achieve nitrogen oxide emissions of less than 30 mg/m³.

Electric boilers need not be elaborated. Because of the use of electricity as a power source, there is no emission of waste gas, which is even more of an "environmental boiler" type.

Most of the environmentally friendly boilers use FGR, full premixing and other advanced combustion technologies to reprocess the flue gas, reuse the flue gas waste heat, and reduce the flue gas temperature. It can not only improve the thermal efficiency of the boiler, but also reduce the emission of harmful substances in the flue gas, and realize the social and economic benefits of environmental protection and energy conservation.

FANGKUAI Boiler has many years of experience in clean boiler manufacturing and sales, and has a number of patented R&D technologies. The boilers produced meet the most stringent air pollution emission standards in China. If you have any needs or problems with the "environmental boiler", you can get in touch with our company directly, and the professional technical engineer will answer your questions in real time.

Nitrogen oxide is one of the main sources of pollution causing air pollution. It is extremely destructive to human body, animals and plants, and the environment. Excessive emission of nitrogen oxides will directly threaten our lives.

Nitrogen and oxygen are not actively mixed together, but when the temperature reaches 1600 ° C, nitrogen and oxygen in the air are mixed to form nitrogen oxides.

At present, the low-nitrogen combustion technology of the gas boiler with better effect has full premixing and FGR.

First, full premixed combustion technology.
       Before the fuel is sent to the furnace for combustion, it is thoroughly mixed with the air beforehand, and the optimal ratio is achieved through precise adjustment and control. After adding surface combustion technology, the combustion temperature in the furnace is further reduced to reduce the role of nitrogen oxides.

Second, FGR combustion technology.
       FGR combustion technology is the flue gas recycling technology. The flue gas generated after the boiler is operated enters the furnace through the connecting pipe to participate in the combustion, and reduces the combustion temperature of the fuel in the furnace to reduce the role of nitrogen oxides.

If you are in the low-nitrogen reform of the headache boiler or want to buy a low-nitrogen boiler at this time, you can contact the FANGKUAI Boiler through the free service hotline above, we will be happy to help you.

Natural circulation and forced circulation are two kinds of circulation states during the operation of the boiler, and the two are essentially different. Fang Kuo Xiaobian will compare and compare these two cycle states, so that you can better understand the boiler operation knowledge.

First, the natural circulation.
       Working principle: The operation mode of actively promoting the water circulation by relying on the density difference caused by the heating of the working medium between the falling pipe outside the furnace and the rising pipe in the furnace. The circulation circuit is composed of a drum, a down pipe, a header, a riser pipe, a steam water introduction pipe and the like. The pot water descends from the outer down pipe of the furnace into the lower header of the water wall, and then is heated into a steam-water mixture (containing steam rate of 5-25%) through the furnace water wall (ie, the riser pipe), and then enters the drum through the soda water introduction pipe to perform steam-water separation. The saturated steam is sent to the superheater, and the pot water still returns to the down tube to continue the circulation.
       The main features of natural circulation boilers are:
       1. Work only under sub-critical pressure. Under the subcritical pressure, the natural circulation boiler with the flue gas parameter of 16.6~18.2 MPa and the working pressure of the drum reaches 18.6~20.6 MPa, and the natural circulation still has sufficient water circulation driving force to achieve safe and reliable operation.
          2. Has a fixed evaporation section end point. The drum separates the two sections of evaporation and superheating, which serve as the heat accumulator and water reservoir of the boiler respectively.
        3. Under the normal operating conditions, the design is correct, can maintain the appropriate circulating water flow rate or cycle rate (the ratio of the circulating water volume entering the rising pipe to its steam production), and has good self-compensation ability, that is, the heat absorption of the circuit increases. The circulating water flow rate also increases.
       4. Under the subcritical pressure, the water-cooled wall often adopts an internally threaded pipe to ensure the ability to effectively prevent the working fluid in the pipe from deviating from the nuclear boiling (DNB).
         5. The salt water concentration and steam quality of the pot water can be maintained by continuous sewage discharge in the drum. The quality of the feed water can be lower than that of the DC boiler, which can reduce the cost of the chemical water treatment part.
        6. The resistance of the steam-water system is small, and the water supply pressure is not high, which can reduce the power consumption of the feed pump.
        7. The drum is thick-walled, the cost is high, and there is a problem of temperature difference between the upper and lower sides and the inner and outer walls, and the starting and stopping time is extended.

Second, the mandatory cycle.
      Working principle: Under the action of the water pump head, the working medium passes through the preheating, evaporation and overheating heating surfaces, and is preheated, evaporated and superheated to the required temperature.
       The water or steam in the forced circulation boiler is not only powered by the difference in density between water and steam, but also requires a certain pump work to circulate in the heating pipe. Due to the good water circulation, the forced circulation furnace has a very low requirement for the water supply speed; the working pressure is generally large, and the material and the wall of the boiler tube are required to be high. The drum of the forced circulation boiler is no longer necessary. It can have a drum and can have no drum. However, the pump head has higher requirements and consumes more electricity. When the pump stops running, the flow of water in the pot also stops, and a reliable method is needed to prevent the water from vaporizing the water.

The difference between the forced circulation boiler and the natural circulation boiler is that the circulation between the downcomer of the natural circulation boiler and the heating surface is generated by the natural indenter between the two, and the forced circulation boiler is forced by the furnace water circulation pump. The forced circulation boiler on the equipment has a furnace water circulation pump (compulsory circulation pump), while the natural circulation boiler does not.
The horizontal boiler evaporation section is generally forced circulation, and the vertical boiler evaporation section is not necessarily a natural circulation, but may also be a forced circulation.

1. Rated thermal power: The thermal energy that the boiler can provide in a unit of time under rated conditions, generally expressed in megawatts (MW) or large calories (Kcal/H).
For boilers with thermal efficiency ≤1.4 MW, the exhaust gas temperature shall not be higher than the inlet medium temperature of 50 °C.
For boilers with a thermal efficiency >1.4 MW, the exhaust gas temperature must not exceed 170 °C.

2. Circulating water volume: The amount of water recycled in the boiler circulating water system.

3. Standard atmospheric pressure: The pressure of sea level at standard atmospheric conditions is 101.325 KPa.
Pressure: The air pressure is higher than the standard atmospheric pressure.
Vacuum: The pressure is below the standard atmospheric pressure.

4. Heating surface: The surface that absorbs heat from the heat release medium and transfers it to the surface of the heat medium, such as the furnace of the boiler, the cylinder, the tube, and the like.
Radiation heating surface: The heating surface that mainly absorbs heat from the heat release medium by radiation heat exchange, such as water wall, furnace gall, and lower abdominal wall of the drum.
Convective heating surface: The heating surface that mainly absorbs heat from high-temperature flue gas by convective heat transfer method, generally the heating surface of flue gas flushing, such as smoke pipe and convection pipe bundle.

5. Boiler thermal efficiency: The percentage of heat that is effectively used by the boiler and the amount of heat consumed by the fuel per unit time. The higher the thermal efficiency, the better the heat transfer performance.

6. steam quality: steam cleanliness, generally saturated steam with more or less traces of saturated water, with a quality of steam exceeding the standard amount of water.

7. Fuel consumption: The amount of fuel consumed by the boiler per unit time.

8. Discharge amount: The amount of sewage discharged when the boiler is discharged.

9. Natural circulation: the boiler boiler that actively pushes the water circulation by the difference of the working medium density between the down pipe outside the furnace and the rising pipe in the furnace. The circulation circuit consists of the drum, the down pipe, the header, the riser pipe, the soda water introduction pipe and the like. composition.
Forced circulation: Water or steam in the boiler should not only be driven by the difference in density of water vapor in the water, but also need to provide some pump power to circulate in the heating pipe.

10. Small boiler: steam boiler with water volume ≤ 50L and rated steam pressure ≤ 0.7MPa; hot water boiler with rated outlet pressure not exceeding 0.1MPa and hot water boiler with tap water pressure.

When the boiler is in the auxiliary machine configuration, the water treatment will be placed in the first place. What is the meaning of water treatment?
Simply put, boiler water treatment refers to pre-softening the water flowing into the boiler and then flowing into the boiler for related use.
Natural water contains various salts. These salts are dissolved in cations and anions, mainly composed of calcium and magnesium ions, and are collectively referred to as "hard water". The minerals contained in these hard water boiled in the container and gradually form a white block or powdery solid, which is what we often call "scale".

First, the main hazard of scale.
       1. Due to the extremely poor thermal conductivity of scale, heat absorption is reduced during heating, boiler thermal efficiency is reduced, fuel utilization is reduced, and boiler operating costs are increased. 2. Fouling will cause the temperature of the furnace wall to increase exponentially. The stress of the steel is destroyed and the strength is reduced. In severe cases, the bursting phenomenon will occur, which will seriously reduce the service life of the boiler.
         2. The calcium and magnesium ions in the water will be integrated into the water during the heating process, which will directly affect the steam quality. At the same time, if the boiler parts such as safety valves, pressure gauges and pressure controllers are scaled, it will cause blockage.

Second, the method of water treatment.
       Boiler water treatment usually uses a combination of a resin tank and a salt tank. When the raw water containing hardness passes through the resin layer of the exchanger, calcium ions and magnesium ions in the water are adsorbed by the resin while releasing sodium ions. The water that flows out of the exchanger is the demineralized water from which the hardness ions are removed. When the resin adsorbs a certain amount of calcium and magnesium ions, it must be regenerated. In the regeneration process, the resin layer is washed with a high-concentration sodium oxide solution in the salt can, and the hardness ions on the resin are replaced, and the resin is restored to the softening exchange function as the recycled waste liquid is discharged out of the tank.

Third, on-site practice.
       1. Check the inlet water pressure (0.2-0.4MPa); check whether the high-concentration brine in the pipe is sufficient; check whether the salt pipe and the sewage pipe are blocked; if there is any abnormality, start it after cleaning.
         2. Close the tap water bypass valve.
       3. Open the salt water inlet pipe valve and open the outlet pipe valve; open the demineralized water to the soft water tank manual and electric valve.
       4. The control valve is energized and the cycle water quantity parameter is set.
       5. start running.